Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.c > #111826
| From | Gareth Owen <gwowen@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: sizeof environment variables array = 1? |
| References | <ohbpd7$5r3$2@dont-email.me> |
| Date | 2017-06-08 16:56 +0100 |
| Message-ID | <878tl2v5ge.fsf@gmail.com> (permalink) |
DFS <nospam@dfs.com> writes:
> int main(int argc, char *argv[], char *env[])
> {
> printf("%d\n",sizeof(env)/sizeof(env[0]));
> return(0);
> )
>
> Output is 1.
>
> Why?
Anything that looks like an array object - when used in the argument
list of a function, is not an array object, but "decays" into a pointer.
so in
int foo(char *arr1[12])
{
char *arr2[12];
char **arr3;
}
arr1 and arr3 have the same type, even though
arr1 and arr2 have the same declaration.
A misfeature, but an explicable one.
There is no way to obtain the size of arr1 in foo() without passing it
in explicitly (or counting them using a sentinel such as NULL to mark
the end, as is done with environment variables)
Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
sizeof environment variables array = 1? DFS <nospam@dfs.com> - 2017-06-08 11:13 -0400
Re: sizeof environment variables array = 1? Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2017-06-08 11:25 -0400
Re: sizeof environment variables array = 1? Keith Thompson <kst-u@mib.org> - 2017-06-08 09:34 -0700
Re: sizeof environment variables array = 1? DFS <nospam@dfs.com> - 2017-06-08 13:14 -0400
Re: sizeof environment variables array = 1? jameskuyper@verizon.net - 2017-06-08 10:51 -0700
Re: sizeof environment variables array = 1? Gareth Owen <gwowen@gmail.com> - 2017-06-08 16:56 +0100
Re: sizeof environment variables array = 1? DFS <nospam@dfs.com> - 2017-06-08 12:18 -0400
Re: sizeof environment variables array = 1? scott@slp53.sl.home (Scott Lurndal) - 2017-06-08 16:35 +0000
Re: sizeof environment variables array = 1? Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2017-06-08 12:43 -0400
Re: sizeof environment variables array = 1? DFS <nospam@dfs.com> - 2017-06-08 13:49 -0400
Re: sizeof environment variables array = 1? "James R. Kuyper" <jameskuyper@verizon.net> - 2017-06-08 13:58 -0400
Re: sizeof environment variables array = 1? DFS <nospam@dfs.com> - 2017-06-08 14:45 -0400
Re: sizeof environment variables array = 1? Keith Thompson <kst-u@mib.org> - 2017-06-08 12:10 -0700
Re: sizeof environment variables array = 1? DFS <nospam@dfs.com> - 2017-06-09 11:21 -0400
Re: sizeof environment variables array = 1? Richard Heathfield <rjh@cpax.org.uk> - 2017-06-09 16:23 +0100
Re: sizeof environment variables array = 1? "James R. Kuyper" <jameskuyper@verizon.net> - 2017-06-09 11:48 -0400
Re: sizeof environment variables array = 1? Richard Heathfield <rjh@cpax.org.uk> - 2017-06-09 16:53 +0100
Re: sizeof environment variables array = 1? "James R. Kuyper" <jameskuyper@verizon.net> - 2017-06-09 12:18 -0400
Re: sizeof environment variables array = 1? Richard Heathfield <rjh@cpax.org.uk> - 2017-06-09 17:28 +0100
Re: sizeof environment variables array = 1? Keith Thompson <kst-u@mib.org> - 2017-06-09 09:12 -0700
Re: sizeof environment variables array = 1? "Patrick.Schluter" <Patrick.Schluter@free.fr> - 2017-06-10 09:28 +0200
Re: sizeof environment variables array = 1? jak <please@nospam.tnx> - 2017-06-08 22:18 +0200
Re: sizeof environment variables array = 1? DFS <nospam@dfs.com> - 2017-06-08 17:31 -0400
Re: sizeof environment variables array = 1? Keith Thompson <kst-u@mib.org> - 2017-06-08 15:12 -0700
Re: sizeof environment variables array = 1? DFS <nospam@dfs.com> - 2017-06-09 11:21 -0400
Re: sizeof environment variables array = 1? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-06-09 16:39 +0100
Re: sizeof environment variables array = 1? Gareth Owen <gwowen@gmail.com> - 2017-06-10 07:26 +0100
Re: sizeof environment variables array = 1? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-06-10 13:21 +0100
Re: sizeof environment variables array = 1? gordonb.q80bx@burditt.org (Gordon Burditt) - 2017-06-10 17:32 -0500
Re: sizeof environment variables array = 1? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-06-11 01:01 +0100
Re: sizeof environment variables array = 1? luser droog <luser.droog@gmail.com> - 2017-06-11 01:28 -0700
Re: sizeof environment variables array = 1? raltbos@xs4all.nl (Richard Bos) - 2017-06-17 18:38 +0000
Re: sizeof environment variables array = 1? Keith Thompson <kst-u@mib.org> - 2017-06-09 08:41 -0700
Re: sizeof environment variables array = 1? "James R. Kuyper" <jameskuyper@verizon.net> - 2017-06-09 11:50 -0400
Re: sizeof environment variables array = 1? raltbos@xs4all.nl (Richard Bos) - 2017-06-17 18:37 +0000
Re: sizeof environment variables array = 1? DFS <nospam@dfs.com> - 2017-06-18 09:11 -0400
Re: sizeof environment variables array = 1? "Patrick.Schluter" <Patrick.Schluter@free.fr> - 2017-06-10 09:19 +0200
Re: sizeof environment variables array = 1? Robert Wessel <robertwessel2@yahoo.com> - 2017-06-08 12:44 -0500
Re: sizeof environment variables array = 1? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-06-08 18:01 +0100
Re: sizeof environment variables array = 1? Gareth Owen <gwowen@gmail.com> - 2017-06-08 18:45 +0100
Re: sizeof environment variables array = 1? Keith Thompson <kst-u@mib.org> - 2017-06-08 11:51 -0700
csiph-web